[ feys-book ]
/ ˈfeɪsˌbʊk /
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the brand name of a social media service and website, launched in 2004.
verb (used with object)
to communicate with (a person) or search for information about (a person) by using Facebook: My old girlfriend just facebooked me.His future employer Facebooked him and decided to withdraw the job offer.
to post on Facebook: I facebooked some photos of my cat.You should Facebook the event so more people will show up.
verb (used without object)
to use Facebook: Does your mom Facebook?
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Question 1 of 10
Which of the following words means “to make a crackling sound; crackle”?
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Also face·book for defs. 2-4 .

Origin of Facebook

First recorded in 2000–05; from facebook, a college student directory with personal photos and basic information

usage note for Facebook

The official trademarked name of the social media platform and website is now styled in all capital letters “FACEBOOK,” though prior to 2020 the trademarked style was “facebook,” in all lowercase letters. Formal writing—as exemplified by most news and book publishers—treats such names as regular proper nouns, in this case “Facebook,” using an initial capital letter, but not all caps. However, when a trade name begins with a lowercase letter followed by an uppercase one, such as eBay or iPad, this spelling is retained, even at the beginning of a sentence.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use Facebook in a sentence

British Dictionary definitions for Facebook

/ (ˈfeɪsˌbʊk) /

noun trademark
a popular social networking website
(tr; sometimes not capital) to search for (a person's profile) on the Facebook website
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012